title: Thermodynamic properties and neutron diffraction studies of silver ferrite AgFeO2.
abstract: We present thermodynamic and neutron scattering data on silver ferrite AgFeO(2). The data imply that strong magnetic frustration Θ/T(N)∼10 and magnetic ordering arise via two successive phase transitions at T(2) = 7 K and T(1) = 16 K. At T<T(2), two metamagnetic phase transitions at B(1)∼14 T and B(2)∼30 T can be identified through the change of slope in the magnetization curve measured up to 53 T. These transitions roughly correspond to an eighth and a quarter of the saturation magnetizations. Unlike for the 'classical' delafossite CuFeO(2), the wavevector of the magnetic structure is independent of temperature both at T<T(2) and at T(2)<T<T(1).
authors.affiliation: Moscow State University, Moscow, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Vasiliev
authors.forename: O
authors.initials: O
authors.lastname: Volkova
authors.forename: I
authors.initials: I
authors.lastname: Presniakov
authors.forename: A
authors.initials: A
authors.lastname: Baranov
authors.forename: G
authors.initials: G
authors.lastname: Demazeau
authors.forename: J-M
authors.initials: JM
authors.lastname: Broto
authors.forename: M
authors.initials: M
authors.lastname: Millot
authors.forename: N
authors.initials: N
authors.lastname: Leps
authors.forename: R
authors.initials: R
authors.lastname: Klingeler
authors.forename: B
authors.initials: B
authors.lastname: Büchner
authors.forename: M B
authors.initials: MB
authors.lastname: Stone
authors.forename: A
authors.initials: A
authors.lastname: Zheludev